# Entropy of a black hole

1. Aug 6, 2004

### kurious

Can someone tell me what the numerical value for the entropy of a black hole of five solar masses would be?
Is it a huge number?

2. Aug 6, 2004

### jcsd

For a Schwarzchild black hole:

$$S = \frac{2\pi kGM^2}{\hbar c}$$

whixh is approximately $1.811 \times 10^{55}\\ JK^{-1}$ For a 5 solar masses Schwarchild black hole

Last edited: Aug 6, 2004
3. Aug 6, 2004

### kurious

Thanks jcsd.
I want to see if I can come up with an equivalent calculation in theory development.